全文获取类型
收费全文 | 140篇 |
免费 | 1篇 |
国内免费 | 1篇 |
专业分类
安全科学 | 6篇 |
废物处理 | 3篇 |
环保管理 | 36篇 |
综合类 | 18篇 |
基础理论 | 36篇 |
环境理论 | 4篇 |
污染及防治 | 23篇 |
评价与监测 | 9篇 |
社会与环境 | 6篇 |
灾害及防治 | 1篇 |
出版年
2021年 | 2篇 |
2020年 | 2篇 |
2019年 | 2篇 |
2018年 | 3篇 |
2017年 | 4篇 |
2016年 | 7篇 |
2015年 | 3篇 |
2014年 | 1篇 |
2013年 | 12篇 |
2012年 | 6篇 |
2011年 | 6篇 |
2010年 | 5篇 |
2009年 | 6篇 |
2008年 | 4篇 |
2007年 | 8篇 |
2006年 | 8篇 |
2005年 | 6篇 |
2004年 | 7篇 |
2003年 | 4篇 |
2002年 | 5篇 |
2001年 | 3篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1998年 | 1篇 |
1997年 | 2篇 |
1996年 | 2篇 |
1995年 | 3篇 |
1994年 | 4篇 |
1993年 | 2篇 |
1990年 | 2篇 |
1988年 | 1篇 |
1987年 | 3篇 |
1986年 | 1篇 |
1985年 | 4篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1972年 | 1篇 |
1965年 | 1篇 |
1964年 | 1篇 |
1958年 | 1篇 |
排序方式: 共有142条查询结果,搜索用时 62 毫秒
141.
Despite a recent emphasis on ‘evidence based policy’ accompanied by an abundance of ‘green’ policy instruments, experience from the European Union and OECD countries shows that decisions which truly aim to balance environmental considerations with social and economic ones remain thin on the ground. Moreover, many policies seem to fall short of, or directly contradict what the available ‘evidence’ suggests is required. This is a synthesis paper bringing together literature from the fields of political science, geography, sociology and science and technology studies to outline some of the obscurities relating to the use of scientific evidence in environmental decision-making. In this paper, we suggest that an exploration of three key inter-related issues is necessary to develop a richer understanding of why evidence and policy interact as they do. These are the nature of evidence itself; the normative, moral or ethical ‘politics’ of policy-making; and the operation of power in the policy process. Our primary goal is to bring various literatures together to better conceptualise the evidence–policy relationship. In so doing, we outline specific challenges for knowledge producers who set research priorities, and design and direct research projects. We also highlight significant implications for policy decision-making processes. 相似文献
142.
Efficient cooperation in eusocial insect colonies requires effective communication, and there is abundant evidence of non-volatile
chemicals playing a role in regulating reproduction within colonies. In contrast, there have been fewer studies investigating
the role of volatile chemicals. This study investigated the potential role of volatile chemicals in regulating queen reproduction
either by directly inhibiting queen reproduction or by honestly signalling queen fecundity to workers. We tested this using
multiple queen colonies of the ant (Leptothorax acervorum) from a functionally monogynous population where one queen monopolizes all reproduction. Nine colonies, each with an established
laying queen, were split to produce two colony fragments—one containing the reproducing queen (group 1) and one containing
only previously non-reproducing queens (group 2). Each group was separated by a fine wire mesh preventing physical contact,
but allowing volatile chemical contact. In each group 2 fragment, we found that a single formerly non-reproductive queen commenced
reproduction and that the rate of egg laying and maximum number of eggs recorded did not significantly differ between groups
1 and 2, results that do not support volatile chemicals as playing a role in regulating queen reproduction. Instead, our findings
suggest that physical contact is necessary to maintain functional monogyny. 相似文献